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Build failed in Jenkins: Mesos » gcc,docker||Hadoop,ubuntu:14.10 #358

See https://builds.apache.org/job/Mesos/COMPILER=gcc,LABEL=docker%7C%7CHadoop,OS=ubuntu%3A14.10/358/changes Changes: [yujie.jay] Added callback to the QoS Controller to retrieve usages from the monitor. [yujie.jay] Added unit tests for fetching ResourceUsage in both QoS Controller and